import React, {
  useCallback, useState, FC, useEffect, ReactNode,
} from 'react';

import nodePath from 'path';

import type { Nullable, IPageToDeleteWithMeta } from '@growi/core';
import { pathUtils } from '@growi/core/dist/utils';
import { useTranslation } from 'next-i18next';
import { useRouter } from 'next/router';
import { UncontrolledTooltip } from 'reactstrap';

import { IPageForItem } from '~/interfaces/page';
import { IPageForPageDuplicateModal } from '~/stores/modal';
import { useSWRxPageChildren } from '~/stores/page-listing';
import { usePageTreeDescCountMap } from '~/stores/ui';
import { shouldRecoverPagePaths } from '~/utils/page-operation';

import CountBadge from '../Common/CountBadge';

import { ItemNode } from './ItemNode';


export type SimpleItemProps = {
  isEnableActions: boolean
  isReadOnlyUser: boolean
  itemNode: ItemNode
  targetPathOrId?: Nullable<string>
  isOpen?: boolean
  onRenamed?(fromPath: string | undefined, toPath: string): void
  onClickDuplicateMenuItem?(pageToDuplicate: IPageForPageDuplicateModal): void
  onClickDeleteMenuItem?(pageToDelete: IPageToDeleteWithMeta): void
  itemRef?
  itemClass?: React.FunctionComponent<SimpleItemProps>
  mainClassName?: string
  customEndComponents?: Array<React.FunctionComponent<SimpleItemToolProps>>
  customNextComponents?: Array<React.FunctionComponent<SimpleItemToolProps>>
};

// Utility to mark target
const markTarget = (children: ItemNode[], targetPathOrId?: Nullable<string>): void => {
  if (targetPathOrId == null) {
    return;
  }

  children.forEach((node) => {
    if (node.page._id === targetPathOrId || node.page.path === targetPathOrId) {
      node.page.isTarget = true;
    }
    else {
      node.page.isTarget = false;
    }
    return node;
  });
};

/**
 * Return new page path after the droppedPagePath is moved under the newParentPagePath
 * @param droppedPagePath
 * @param newParentPagePath
 * @returns
 */

/**
 * Return whether the fromPage could be moved under the newParentPage
 * @param fromPage
 * @param newParentPage
 * @param printLog
 * @returns
 */

// Component wrapper to make a child element not draggable
// https://github.com/react-dnd/react-dnd/issues/335
type NotDraggableProps = {
  children: ReactNode,
};
export const NotDraggableForClosableTextInput = (props: NotDraggableProps): JSX.Element => {
  return <div draggable onDragStart={e => e.preventDefault()}>{props.children}</div>;
};

type SimpleItemToolPropsOptional = 'itemNode' | 'targetPathOrId' | 'isOpen' | 'itemRef' | 'itemClass' | 'mainClassName';
export type SimpleItemToolProps = Omit<SimpleItemProps, SimpleItemToolPropsOptional> & {page: IPageForItem};

export const SimpleItemTool: FC<SimpleItemToolProps> = (props) => {
  const { t } = useTranslation();
  const router = useRouter();
  const { getDescCount } = usePageTreeDescCountMap();

  const page = props.page;

  const pageName = nodePath.basename(page.path ?? '') || '/';

  const shouldShowAttentionIcon = page.processData != null ? shouldRecoverPagePaths(page.processData) : false;

  const descendantCount = getDescCount(page._id) || page.descendantCount || 0;

  const pageTreeItemClickHandler = (e) => {
    e.preventDefault();

    if (page.path == null || page._id == null) {
      return;
    }

    const link = pathUtils.returnPathForURL(page.path, page._id);

    router.push(link);
  };

  return (
    <>
      {shouldShowAttentionIcon && (
        <>
          <i id="path-recovery" className="fa fa-warning mr-2 text-warning"></i>
          <UncontrolledTooltip placement="top" target="path-recovery" fade={false}>
            {t('tooltip.operation.attention.rename')}
          </UncontrolledTooltip>
        </>
      )}
      {page != null && page.path != null && page._id != null && (
        <div className="grw-pagetree-title-anchor flex-grow-1">
          <p onClick={pageTreeItemClickHandler} className={`text-truncate m-auto ${page.isEmpty && 'grw-sidebar-text-muted'}`}>{pageName}</p>
        </div>
      )}
      {descendantCount > 0 && (
        <div className="grw-pagetree-count-wrapper">
          <CountBadge count={descendantCount} />
        </div>
      )}
    </>
  );
};

export const SimpleItem: FC<SimpleItemProps> = (props) => {
  const {
    itemNode, targetPathOrId, isOpen: _isOpen = false,
    onRenamed, onClickDuplicateMenuItem, onClickDeleteMenuItem, isEnableActions, isReadOnlyUser,
    itemRef, itemClass, mainClassName,
  } = props;

  const { page, children } = itemNode;

  const [currentChildren, setCurrentChildren] = useState(children);
  const [isOpen, setIsOpen] = useState(_isOpen);
  const [isCreating, setCreating] = useState(false);

  const { data } = useSWRxPageChildren(isOpen ? page._id : null);

  const stateHandlers = {
    isOpen,
    setIsOpen,
    isCreating,
    setCreating,
  };

  // descendantCount
  const { getDescCount } = usePageTreeDescCountMap();
  const descendantCount = getDescCount(page._id) || page.descendantCount || 0;


  // hasDescendants flag
  const isChildrenLoaded = currentChildren?.length > 0;
  const hasDescendants = descendantCount > 0 || isChildrenLoaded;

  const hasChildren = useCallback((): boolean => {
    return currentChildren != null && currentChildren.length > 0;
  }, [currentChildren]);

  const onClickLoadChildren = useCallback(async() => {
    setIsOpen(!isOpen);
  }, [isOpen]);

  // didMount
  useEffect(() => {
    if (hasChildren()) setIsOpen(true);
  }, [hasChildren]);

  /*
   * Make sure itemNode.children and currentChildren are synced
   */
  useEffect(() => {
    if (children.length > currentChildren.length) {
      markTarget(children, targetPathOrId);
      setCurrentChildren(children);
    }
  }, [children, currentChildren.length, targetPathOrId]);

  /*
   * When swr fetch succeeded
   */
  useEffect(() => {
    if (isOpen && data != null) {
      const newChildren = ItemNode.generateNodesFromPages(data.children);
      markTarget(newChildren, targetPathOrId);
      setCurrentChildren(newChildren);
    }
  }, [data, isOpen, targetPathOrId]);

  const ItemClassFixed = itemClass ?? SimpleItem;

  const commonProps = {
    isEnableActions,
    isReadOnlyUser,
    isOpen: false,
    targetPathOrId,
    onRenamed,
    onClickDuplicateMenuItem,
    onClickDeleteMenuItem,
    stateHandlers,
  };

  const CustomEndComponents = props.customEndComponents;

  const SimpleItemContent = CustomEndComponents ?? [SimpleItemTool];

  const SimpleItemContentProps = {
    itemNode,
    page,
    onRenamed,
    onClickDuplicateMenuItem,
    onClickDeleteMenuItem,
    isEnableActions,
    isReadOnlyUser,
    children,
    stateHandlers,
  };

  const CustomNextComponents = props.customNextComponents;


  return (
    <div
      id={`pagetree-item-${page._id}`}
      data-testid="grw-pagetree-item-container"
      className={`grw-pagetree-item-container ${mainClassName}`}
    >
      <li
        ref={itemRef}
        className={`list-group-item list-group-item-action border-0 py-0 pr-3 d-flex align-items-center
        ${page.isTarget ? 'grw-pagetree-current-page-item' : ''}`}
        id={page.isTarget ? 'grw-pagetree-current-page-item' : `grw-pagetree-list-${page._id}`}
      >
        <div className="grw-triangle-container d-flex justify-content-center">
          {hasDescendants && (
            <button
              type="button"
              className={`grw-pagetree-triangle-btn btn ${isOpen ? 'grw-pagetree-open' : ''}`}
              onClick={onClickLoadChildren}
            >
              <div className="d-flex justify-content-center">
                <span className="material-symbols-rounded">arrow_right</span>
              </div>
            </button>
          )}
        </div>
        {SimpleItemContent.map(ItemContent => (
          <ItemContent {...SimpleItemContentProps} />
        ))}
      </li>

      {CustomNextComponents?.map(UnderItemContent => (
        <UnderItemContent {...SimpleItemContentProps} />
      ))}

      {
        isOpen && hasChildren() && currentChildren.map((node, index) => (
          <div key={node.page._id} className="grw-pagetree-item-children">
            <ItemClassFixed itemNode={node} {...commonProps} />
            {isCreating && (currentChildren.length - 1 === index) && (
              <div className="text-muted text-center">
                <i className="fa fa-spinner fa-pulse mr-1"></i>
              </div>
            )}
          </div>
        ))
      }
    </div>
  );
};